home *** CD-ROM | disk | FTP | other *** search
- ;;;; Copyright (C) 2000, 2001 Free Software Foundation, Inc.
- ;;;;
- ;;;; This program is free software; you can redistribute it and/or modify
- ;;;; it under the terms of the GNU General Public License as published by
- ;;;; the Free Software Foundation; either version 2, or (at your option)
- ;;;; any later version.
- ;;;;
- ;;;; This program is distributed in the hope that it will be useful,
- ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
- ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- ;;;; GNU General Public License for more details.
- ;;;;
- ;;;; You should have received a copy of the GNU General Public License
- ;;;; along with this software; see the file COPYING. If not, write to
- ;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
- ;;;; Boston, MA 02111-1307 USA
- ;;;;
- ;;;; As a special exception, the Free Software Foundation gives permission
- ;;;; for additional uses of the text contained in its release of GUILE.
- ;;;;
- ;;;; The exception is that, if you link the GUILE library with other files
- ;;;; to produce an executable, this does not by itself cause the
- ;;;; resulting executable to be covered by the GNU General Public License.
- ;;;; Your use of that executable is in no way restricted on account of
- ;;;; linking the GUILE library code into it.
- ;;;;
- ;;;; This exception does not however invalidate any other reasons why
- ;;;; the executable file might be covered by the GNU General Public License.
- ;;;;
- ;;;; This exception applies only to the code released by the
- ;;;; Free Software Foundation under the name GUILE. If you copy
- ;;;; code from other Free Software Foundation releases into a copy of
- ;;;; GUILE, as the General Public License permits, the exception does
- ;;;; not apply to the code that you add in this way. To avoid misleading
- ;;;; anyone as to the status of such modified files, you must delete
- ;;;; this exception notice from them.
- ;;;;
- ;;;; If you write modifications of your own for GUILE, it is your choice
- ;;;; whether to permit this exception to apply to your modifications.
- ;;;; If you do not wish that, delete this exception notice.
- ;;;;
-
- ;;;; A simple value history support
-
- (define-module (ice-9 history))
-
- (process-define-module '((value-history)))
-
- (define (use-value-history x)
- (module-use! (current-module)
- (resolve-module '(value-history))))
-
- (define save-value-history
- (let ((count 0)
- (history (resolve-module '(value-history))))
- (lambda (v)
- (if (not (unspecified? v))
- (let* ((c (1+ count))
- (s (string->symbol (simple-format #f "$~A" c))))
- (simple-format #t "~A = " s)
- (module-define! history s v)
- (set! count c))))))
-
- (add-hook! before-eval-hook use-value-history)
- (add-hook! before-print-hook save-value-history)
-